The fractures occur when an erect penis sustains some form of trauma.

If an erect penis gets hit or bent, the tissue surrounding the corporeal bodies may not be able to withstand the force.

"The surrounding tissue that's holding the pressure inside can't withstand it anymore," Dr. Jacob Rajfer, professor of urology at the David Geffen School of Medicine at UCLA, said, according to Men's Health. "And that's when the rupture occurs."

It could happen, for instance, if you thrust hard and miss your partner's orifice, or if your partner accidentally sits on your erect dick.

If it happens to you, there's a chance you'll hear it.

There are other symptoms too.

Unsurprisingly, you may lose your erection right away, according to the Mayo Clinic. Dark bruises may also appear on your penis. If the fracture affects your urethra — the tube through which urine and semen leave the body — you may also notice blood in your pee.